OTTO ClearTrak heavy duty headsets are IS/ATEX certified and offer a certified noise reduction rating (NRR) of 24dB. Fitting snugly to the head, the headset can be worn comfortably under a helmet. The push-to-talk switch is positioned on the ear cup for added convenience. ClearTrak offers superior intelligibility and the additional hearing protection necessary for consistent, clear communication. Compatible with Motorola APX4000, APX6000/APX6000XE, APX7000/APX7000XEDP3400, DP3401, DP3600, DP3601, XPR6100,XPR6350, XPR6380, XPR6550, XPR6580, XPR7350, XPR7550Heavy-duty headset with certified noise reduction rating (NRR) of 24dB Built with an extreme noise-canceling microphone (3dB-Standard) (19dB-ClearTrak) Noise Reduction rating: 24dB PTT switch located on the ear cup Flexible, heavy-duty coil cord Comfortable, dual cloth covered ear seals Behind the head suspension system provides stability during rigorous movement Specifications Cable pull from ear cup, axial: 20 lbs Cable pull from connector, axial: 30 lbs 24 month manufacturer's warranty Microphone sensitivity at 94dB SPL: -48.5 typical Operating temperature: -30Adeg C to +75Adeg C Storage temperature: -40Adeg C to +85Adeg C Microphone type: Boom Mic Audio connector: M83-MF x83 Warranty: 3 years